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  2. The 6 Best Sound Machines for a Restful Night's Sleep - AOL

    www.aol.com/6-best-sound-machines-restful...

    In addition to an adjustable strap, this sound machine from the experts at Yogasleep contains 20 noise options, and a sleep timer for either a 45-, 90 minute, or eight-hour snooze.

  3. 8 white noise machines for better sleep - AOL

    www.aol.com/news/8-white-noise-machines-better...

    Sleep experts say using a white noise machine can improve sleep. Here, editor-tested picks from Hatch, HoMedics, YogaSleep and more. 8 white noise machines for better sleep

  4. 5 Great Sound Machines That Will Transform Your Sleep - AOL

    www.aol.com/5-great-sound-machines-sleeping...

    Dreamegg White Noise Machine. Sometimes the hardest place to find a good night’s sleep is on the road. If you’re a light sleeper who can’t sleep, even on vacation, or a road warrior who ...

  5. White noise machine - Wikipedia

    en.wikipedia.org/wiki/White_noise_machine

    A white noise machine is a device that produces a noise that calms the listener [citation needed], which in many cases sounds like a rushing waterfall or wind blowing through trees, and other serene or nature-like sounds. Often such devices do not produce actual white noise, which has a harsh sound, but pink noise, whose power rolls off at ...

  6. Noise-cancelling headphones - Wikipedia

    en.wikipedia.org/wiki/Noise-cancelling_headphones

    Both passive isolating and active noise-cancellation headphones or earplugs help to achieve a reduction of ambient sounds, which is particularly helpful for people suffering from insomnia or other sleeping disorders, for whom sounds such as cars honking and snoring impact their ability to sleep. For that reason, noise-cancelling sleep ...

  7. Active noise control - Wikipedia

    en.wikipedia.org/wiki/Active_noise_control

    The wavelength in air of sinusoidal noise at approximately 800 Hz is double the distance of the average person's left ear to the right ear; [1] such a noise coming directly from the front will be easily reduced by an active system but coming from the side will tend to cancel at one ear while being reinforced at the other, making the noise ...